having trouble deducting what the best form of inj. test is for TRT in a younger male

Cypionate
Enathate
or a blend like Sustanon

As an aside -- If you're self-injecting, try putting the loaded syringe on a hot pad for half an hour (set the hot pad on LOW!!). Cyp and Enan are suspended in oil and heating the oil will greatly increase the viscosity.

T-Cyp is made with cotton-seed oil. Enanthate with sesame oil. Other than that, not much difference, though I've heard T-cyp is slightly less viscous, and is a little less long-acting (but not enough to make a real difference).

In Australia Sus is prescribed a lot more than Enth, maybe to try keep Enth off the black market as its sought after a lot more than Sus. But I wonder what is the point of Sus it must have some benefits, what are the benefits of doing prop E2D over Enth E2D? Apart from initially getting your levels up quicker.

For optimal results you need to inject at least twice a week. Many inject EOD. When doing that, T levels will always be very steady and then there is no concern about what ester is fast and what is slow. And no need for propitiatory ester blends.

T eth has more T per mg and would provide more T that an equal dose of T cyp. But if you are adjusting T dose to achieve high normal FT or bio-T, then the dose simply gets increased. But most docs do not think that way.

T cyp will flow through a 0.5ml 0.5" #29 insulin syringe. [Do not use 1.0ml.]